<!DOCTYPE html>
<html>
    <head>
        <title>内容过滤器</title>
        <script src="./js/jquery-3.6.0.min.js" type="text/javascript"></script>
        <script>
            $(document).ready(function() {
                $("td:empty").css("background","blue")
            });
        </script>
    </head>
    <body>
        <table>
            <tr><th>ID</th><th>姓名</th><th>性别</th><th>年龄</th><th>学历</th></tr>
            <tr>
                <td>001</td>
                <td>张三</td>
                <td>女</td>
                <td></td>
                <td>大专</td>
            </tr>
            <tr>
                <td>002</td>
                <td>李四</td>
                <td>男</td>
                <td>30</td>
                <td></td>
            </tr>
            <tr>
                <td>003</td>
                <td>王五</td>
                <td></td>
                <td>25</td>
                <td>本科</td>
            </tr>
        </table>
    </body>
</html>